The 235 six is about 1 12 inches shorter than the GMC sixes. They used the timing cover mount on the 235 to set the engine in instead of using the correct side mounts for the 235.
Some Canadian GMS may have had the 235 instead of the 270. My bet is they would have used the side mounting holes on the block so the mounts would line up with the holes in the frame.
The 270 GMC six may have had the side mount system too. maybe someone can chime in that knows more about that.
The 1955-1959 gmc 6 cylinder motors were a side mount motor. That was explained in my post above. The front mount or yoke only used one bolt through the crossmember. The cushion had an oval shaped lip and a peg to positively locate it into the crossmember. Chevy and GMC trucks used different front crossmembers. The 58 and 59 gmc front crossmember almost looks like a chevy crossmember. The 55-57 GMC crossmembers are completely different from the 58-59 gmc crossmembers or the 55-59 chevy crossmembers. I suspect Canadian GMC trucks would have used the chevy front crossmember.
